If memory serves Custer dismissed his scouts just before the advance on the village, they legged it with a few captured Indian ponies. I believe those with Reno and Benteen took part in the fighting. Bloody Knife, a scout with Reno's command, certainly died in the initial charge.

You are mixing up the scouts. Custer set out from Dakota Territory with Several Arikaree warriors, who were long time enemies of the Lakota. But the "Rees" knew Dakota Territory, not the Powder River country of SE Montana Territory. When the decision was made on the Far West to send Custer up the Rosebud, while the rest came up the Big Horn, Custer was given six Crow scouts under Mitch Boyer, a French/Lakota who grew up with the Crow. The Crow were also long-time enemies of the Lakota. They knew the Powder River country well because it was part of the territory the Crow considered as theirs. The Ree were sent with Reno. They were given a mission of hitting the pony herd, with the horses to be their payment. The scouts with Custer's detachment were Crow. The agreement with Custer was that they were to find the Lakota/Cheyenne but had no obligation to fight. They were allowed to leave. Boyer stayed and died with Custer.

__________________No one has greater love than this, to lay down one's life for one's friends John 15:13